I recently purchased a Samsung SCH-u520 (US Cellular) and I am currently working to reverse engineer it for use with BitPIM  I will post my findings on this page. (using the file viewer to modify content on the phone, and hopefully developing offical BitPIM support eventually)

WARNING: All activities described in this article may result in permanent damage to your phone.  No guarantee or warranty will be offered from jmaxxz.com (and prolly not from Samsung).

Reverse engineering always carries a certain risk proceed with caution if you attempt anything described in this article.